全文获取类型
收费全文 | 27472篇 |
免费 | 1124篇 |
国内免费 | 11篇 |
出版年
2020年 | 311篇 |
2019年 | 367篇 |
2018年 | 522篇 |
2017年 | 541篇 |
2016年 | 618篇 |
2015年 | 460篇 |
2014年 | 476篇 |
2013年 | 2356篇 |
2012年 | 883篇 |
2011年 | 959篇 |
2010年 | 568篇 |
2009年 | 586篇 |
2008年 | 730篇 |
2007年 | 827篇 |
2006年 | 693篇 |
2005年 | 658篇 |
2004年 | 645篇 |
2003年 | 635篇 |
2002年 | 638篇 |
2001年 | 864篇 |
2000年 | 814篇 |
1999年 | 637篇 |
1998年 | 318篇 |
1997年 | 279篇 |
1996年 | 297篇 |
1995年 | 272篇 |
1994年 | 266篇 |
1992年 | 520篇 |
1991年 | 482篇 |
1990年 | 480篇 |
1989年 | 434篇 |
1988年 | 444篇 |
1987年 | 414篇 |
1986年 | 420篇 |
1985年 | 426篇 |
1984年 | 344篇 |
1983年 | 331篇 |
1982年 | 245篇 |
1979年 | 390篇 |
1978年 | 295篇 |
1975年 | 292篇 |
1974年 | 371篇 |
1973年 | 376篇 |
1972年 | 300篇 |
1971年 | 292篇 |
1970年 | 283篇 |
1969年 | 259篇 |
1968年 | 361篇 |
1967年 | 310篇 |
1966年 | 288篇 |
排序方式: 共有10000条查询结果,搜索用时 328 毫秒
321.
This project studied the effects of weather variables and size of the population on minor and major violence rates within six prisons in the Kingston, Ontario, Canada area from January, 1980 through December, 1983. While weather variables have been studied in relation to mood changes within the general population, this study was the first to analyze the impact of weather variables on rates of violence within the prison setting using forward inclusion multiple regression. Analysis showed that population size consistently appeared positively correlated with assaults on other inmates among the male medium-security prisoners during the summer months. In the summer months, temperature tended to be positively related to some minor kinds of offenses, but in the winter months the relationship was negative. Humidity, rain, sunshine hours, snow, and snow on the ground were not consistently related to incidences of minor and major violence. Indices of geomagnetic disturbances had statistically significant inverse relationships with attempted suicide/self-inflicted injury rates among the male prisoners during the summer months. Over 12 months, wind was generally negatively correlated with incidences of major and minor violence among the male inmates. For 6-mo. periods, wind was generally positively correlated with violence rates during the winter months and negatively correlated during the summer months among the male inmates. The findings relating weather variables to violence rates in the women's prison were consistently in opposition to those found for male prisoners during the 4-yr. period. 相似文献
322.
323.
324.
325.
326.
Robert D. Felner Mark S. Aber Judith Primavera Ana M. Cauce 《American journal of community psychology》1985,13(4):365-379
The relationship of characteristics of the social environment to the adaptation of adolescents from high-risk predisposing environments was examined. Specifically, the degree to which adolescents' perceptions of various dimensions of their family and school environment as well as sources of social support related to differential levels of personal well-being and academic adjustment was explored. Multiple regression analyses revealed differences in the salience of the dimensions of the social environment as a function of the particular sphere of functioning under consideration. Implications of the findings for developing a model for understanding the relative vulnerability of individuals at risk as well as of the design of preventive interventions are discussed. 相似文献
327.
In two experiments, subjects read passages of text and circled instances of a target letter under normal conditions or while engaged in articulatory suppression. In Experiment 1, subjects searching for the letter e made a disproportionately large number of errors on the word “the” and more errors when e occurred in unstressed than in stressed syllables of three-syllable words. In Experiment 2, subjects searching for the letter f made an exceedingly large number of errors on the word “of.” Articulatory suppression significantly reduced the stress effect in the three-syllable words but did not reduce the tendency to make errors on “the” or “of,” suggesting that phonological recoding is responsible for this effect of stress but does not influence the unitization processes of reading. 相似文献
328.
Since both speech and color have perceptual ramifications in language, the present study was developed to study speech perception through color perception. With the recent advances in perception generally and color perception specifically, this nontraditional approach to studying speech perception appeared reasonable. The 12 consonants utilized in this study generated 144 pairs of nonsense CV-syllables. The consonant ensemble was selected because it accommodated a maximum number of phonological features with a minimum number of phonemes. The 46 subjects, who were in junior high school with an age range of 11 through 14 years, responded to each of the stimulus pairs by assigning (associating) to it one of the six primary colors. Because of the perceptual orderliness associated with subjects' judgments, the results indicated that color can be used to study speech perception. Specific findings included the retrieval of sameness, fronting (or place), and voicing.This study is based on a master's thesis presented to the Graduate School, Tennessee State University in Nashville. The authors gratefully acknowledge the cooperation and assistance of the Speech and Hearing Institute at the University of Texas Health Science Center-Houston. 相似文献
329.
This study examined the utility of classifying boys on the basis of a typology of antisocial behavior. A group of 195 boys, aged 10–17, was divided into four mutually exclusive groups based on their pattern of antisocial behavior. Stealing and fighting were chosen as criteria to define the four groups: (a) boys who fought but did not steal (Exclusive Fighter Group), (b) boys who stole but did not fight (Exclusive Theft Group), (c) boys who stole and fought (Versatile Antisocial Group), and (d) boys who did neither (Remaining Group). A multimethod-multirespondent study of these boys showed that (a) the Exclusive Fighter Group tended to score high on a range of overt antisocial behaviors and were relatively little involved in delinquency; (b) the Exclusive Theft Group tended to score high on some overt antisocial behaviors and were much involved in delinquency; (c) Versatile Antisocial youths scored highest among all groups on almost all overt and covert antisocial behaviors, and in terms of delinquent acts. The Versatile boys came from families with the most disturbed child-earing practices.The authors are indebted to Gerald Patterson for his inspiration and encouragement through-out the study. They acknowledge the most helpful comments they have received during earlier drafts of this paper from Drs. John Reid, Magda Stouthamer-Loeber, and Mark Weinrott.The paper was presented at the annual meeting of the American Society of Criminology, Denver, Colorado, November 10, 1983. The study has been funded by the Center for Studies in Crime and Delinquency, National Institute of Mental Health, Grants MH 32857 and MH 37940. 相似文献
330.
D B Boles 《Brain and language》1985,26(1):106-116
Word recognition typically is better or faster in the right visual field than in the left visual field, an effect that often interacts with the handedness of subjects or the phonetic characteristics of the language employed. While these findings suggest a hemispheric locus, it is possible that the field difference is confounded with display or report order asymmetries. Here two experiments manipulate word orientation (horizontal vs. vertical), letter symmetry, and report order variables, and they demonstrate a generalized right field superiority that fails to interact with other factors. Since the superiority appears even when all apparent artifactual asymmetries are eliminated, the findings support a hemispheric interpretation. 相似文献